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I am trying to convert the image: ImageView sentObject into byte Array. I found the way to convert it in [ 1 ] so I wrote the code as below. 

public void sendImage(ImageView sentObject)
　　　　　　　{
            PixelReader pixelReader=sentObject.getImage().getPixelReader();
            int width =(int) sentObject.getImage().getWidth();
            int height =(int) sentObject.getImage().getHeight();
            byte[] buffer=new byte[width*height*4];
            System.out.println("Byte1: "+buffer);
            try
                {
                pixelReader.getPixels(0,0,width,height,PixelFormat.getByteBgraInstance(),buffer,0,width*4);
                System.out.println("Byte2: "+buffer);
                //pixel[i][j]=sentObject.getImage().getPixelReader().getColor(i,j);
                DataOutputStream out = new DataOutputStream(client.getOutputStream());
                out.write(buffer);
                out.flush();
                }
            catch(IOException IO)
                {
                IO.printStackTrace();
                }
            }

The main point I want you to look is getPixels method. This method will convert an image into bytes and store those bytes in byte array (in my case, it is byte[] buffer) However When I compiled and ran, it didn't seem to store the bytes for me. I put the debug statement: System.out.println("Byte1: "+buffer); and System.out.println("Byte2: "+buffer);Then the output is as below:

enter image description here

The buffer before and after activates getPixels are the same which means there are no pixels stored in the buffer. What should I do to store the pixels by getPixels method. And do I misunderstand anything?

Reference

[ 1 ] Pure JavaFX: convert Image to bytes Array (+ opposit operation). What's wrong?

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Hajime
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  • "The `buffer` before and after activates `getPixels` are the same which means there are no pixels stored in the `buffer`" - umm no. All you can tell is that it is still the same array: you are not looking at the content of the array at all. – James_D May 11 '17 at 13:19
  • How can I look at the content of the array? James_D – Hajime May 11 '17 at 14:46
  • `System.out.println(Arrays.toString(buffer));`, for example (or just use a loop and show the first few elements, if you don't want the whole thing) – James_D May 11 '17 at 14:48

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